Malicious PDF — malware analysis report

Static analysis result for SHA-256 882171a1c87daaa2…

MALICIOUS

PDF

87.8 KB Created: 2021-08-08 11:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a10aeb05e9c4ee822938b9cbe1e968df SHA-1: 8e43a92e82900c595e8568adf0488317c8b4b5e2 SHA-256: 882171a1c87daaa2894a4ae5373af12c8a42e51bc200d92e00481375e70445b6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of embedded JavaScript and a 'Clipboard command execution lure' heuristic suggests the document is designed to prompt the user to execute commands, likely to download and run a second-stage payload. The numerous external URLs, many hosted on compromised CMS upload directories or disposable hosting, further support its role as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=the+bee+movie+script+in+spanish+copy+and+paste PDF link annotation
    • http://billsky.ee/files/file/vinimabeguzewukog.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57049066a---78808711356.pdfIn PDF document text
    • http://schubert-hh.de/image/file/duzagusumofapipaguki.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/werefakopiperevuwatoneri.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076315ad129b---bumupuduke.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/2269192326.pdfIn PDF document text
    • http://fxmeat.com/upload/file/0acdc70bbebbf654f7b6ac391eab7f80.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/q860ogvi622b31g47v78fc0kg5/gikababobifov.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4cd3b825a2093610e972cb659d998d3f/pinuripazaxutenab.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/be6342c127c0236fd9a76296e684410e/worolowanuterojojafo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12be0aa58---17439821612.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/kodutpsph8pai3d57vevllgd41/53909317079.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac731fb45---99746599273.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/11b47eae72d405d1394f92399efde011/49263715707.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/013f54f0a5d461d8d20981d14e6f2b4c/45067977621.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68674001506.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/renajesetimalofujolajep.pdfIn PDF document text
    • https://bem-sa.com/img/file/jijotelozifus.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b580fb9efa6---jezeg.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/22402264642.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abe4356df05---buwuluf.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881a8a6745c---livukewefojemakijanopeki.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/18372158350.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/nelowimigezajadoburus.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/90374273609.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 17648 bytes
SHA-256: 3fd473bb35731b0f95d607e3676d2fa54536d7029340cbfa09bfdcc5acc2410c
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 11016 bytes
SHA-256: c43dfd1ec7e8a720b300c19609211943c1ad8882c328228fb3438ffa9b213c25

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